钢厂铁路运输无人化道口安全监控

钢厂的铁路道口经历了多次升级，由原来道口现场有人值守道口，改为道口现场无人值守的远程集控；再由远程人工操作、自动监控、升级到道口智能化自动运行；实现无人化道口安全监控，为钢厂铁路运输自动驾驶、运输过程无人化奠定基础，保障运输列车通过道口时安全畅通；无人化道口是钢厂铁路无人化运输系统中不可缺少的重要环节。     

冶金企业铁路道口自动信号系统的应用

根据冶金企业铁路线路、运输组织方式、道口设置的特点,分析比较现有几种点式传感器铁路道口自动信号系统的不同特性,结合实际工程的设计、施工,对有源传感器铁路道口自动信号系统的应用进行分析、探讨。     

石钢集中道岔平交道口自动报警控制系统

利用无源磁感应技术建立的铁路道口自动报警控制系统,实现了道口的无人值守,解决了石钢站场道岔集中区段内平交道口的交通难题。     

韶钢道口自动报警装置获专利

韶钢道口自动报警装置获专利最近，国家专利局正式批准，广东韶钢集团公司研制的“铁路平交道口自动报警装置”获得发明专利权。该装置是韶钢运输部助理技师罗东元于１９９１年发明的，经几年来在韶钢的１６处道口应用，证明其有结构简单、易装、易用、易维修、易维护、投...     

武钢铁路道口安全防护系统

简要介绍武钢铁路道口安全防护系统设备组成,详细分析了运输部自行研究制造的电动栏木装置工作原理和技术性能、维修标准以及应用情况,并提出在有人看守道口安装ZK－B型自动报警设备的必要性。     

铁路道口信号自动防护系统研究与应用

铁路道口是铁路路外事故多发地段,国家铁路和地方铁路目前采用的防护系统尚存在一些问题。经多方调查研究,结合现行可靠设备和开滦煤矿实际,综合利用研究开发一套可以满足需要的铁路道口信号自动防护系统。     

中板无人道口自动报警系统的设计

介绍一种新颖实用的无人道口自动报警系统,并详细分析了该系统的电气原理及工作原理。     

钢铁厂厂区铁路道口设计方案的选择

论述了铁路道口的几种设计方案及其比较，．认为液压传动道口安全装置在北方寒冷地区不宜使用.     

贵冶铁路运输智能化系统的设计与实现

对大型厂矿企业来说,铁路运输作为其供应链部分的关键环节,有效衔接了原材料的接入和产品的外发。它既是产生基础信息的源头,也是形成产品外销信息的最末端,其信息化和自动化水平对整个厂矿企业的信息化和智能化建设起着决定性作用。为进一步提高铁路信息化和智能化水平,贵溪冶炼厂结合自身实际对现有铁运调度设施进行了全面升级,通过新建车号识别系统、全电子计算机联锁系统、调度监督系统、调度集中系统、计划智能编排系统、机车无线作业系统、道口远程控制系统等,并将所有子系统通过铁运物流应用系统进行集成,实现了车号自动采集、基础信息自动读取匹配、机车位置自动跟踪、调车进路自动预排、计划智能编排、计划无线传输和道口远程控制等,为贵冶智能化工厂的建设夯实了基础。     

浅探莱钢铁路道口问题及对策

铁路道口是事故多发地点，针对莱钢铁路道口在安全管理上存在的问题，提出互动互控共同负责管理模式，营造规范的铁路道口行车次序和良好的道口交通环境，减少道口事故，确保安全生产。     

高校档案服务创新的必要性及实施路径研究

档案的价值和意义是通过为社会服务而实现的,高校档案工作的服务性,是高校档案馆赖以生存和发展的基础。创新高校档案服务机制是信息社会发展的必然要求,是高等教育改革的必然要求,是高校档案馆自身发展的必然要求。要实现高校档案服务创新,一是要建立现代化的管理方式、服务手段和服务方式;二是拓展档案信息的校内服务功能;三是凝练一支整体素质过硬的档案工作团队;四是加强学校服务和社会服务功能逐步渗透。     

Equivalent Beam-Column Method to Estimate In-Plane Critical Loads of Parabolic Fixed Steel Arches

The objective of this paper is to investigate the characteristics of critical loads for parabolic fixed steel tubular arches. An advanced nonlinearity finite-element program, taking into account the geometric and material dual nonlinearity, is employed. The influence of nonlinearity and initial crookedness on arch critical load is discussed. It is found that the effect of rise-to-span ratio on the critical load of arch is significant. Therefore, a new equivalent beam-column method is proposed for estimating the corresponding in-plane critical loads of arch, in which a buckling factor K1 is employed to consider influence of rise-to-span ratio and a reduction factor K2 to consider the effect of initial crookedness. Pragmatic formulas and tabulated data are provided based on the present different Chinese design codes. It is proved that the presented method is sufficiently accurate to predict the in-plane critical load of parabolic fixed steel arch subjected to compression or to both bending and compression.     

Bayesian Model Calibration Using Geotechnical Centrifuge Tests

The predicted performance using a geotechnical prediction model is expected to deviate from reality. A practical approach to assess the model error is through calibration with observed performances in physical model tests. In this paper, a Bayesian framework of model calibration using centrifuge modeling tests is proposed and the procedure of model calibration is illustrated. Two centrifuge tests conducted to investigate the performance of soil slopes under rainfall conditions are used to calibrate a coupled hydromechanical analysis model. It is found that for centrifuge tests with different levels of soil variability, the test with a smaller variability of soil properties is more efficient for model calibration. According to the concept of random field, a centrifuge model with a larger model size and accelerated to a lower acceleration is better for model calibration. When the discrepancy between the performance interpreted from the centrifuge model and the field performance is small, the improvement of the reliability estimation for a new slope is significant. However, when there is little information about the discrepancy, the reliability estimation cannot be significantly improved by the information from centrifuge modeling. The proposed procedure is shown to be able to quantify the calibration effects of centrifuge tests and may be used to achieve a more reliable calibration.     

Fully Probabilistic Framework for Evaluating Excavation-Induced Damage Potential of Adjacent Buildings

This paper presents a framework for a fully probabilistic analysis of the potential for damage to buildings adjacent to an excavation. Herein, the damage potential index (DPI), which is a function of angular distortion and lateral strain, is used to assess building damage potential. A serviceability limit state is established in which the resistance is expressed in terms of the “limiting” DPI, and the load is represented by the “applied” DPI. In this context, damage to the building adjacent to an excavation is said to occur deterministically if the applied DPI is greater than the limiting DPI. For the fully probabilistic analysis, both parameter and model uncertainties of the limiting and applied DPIs are first characterized. The analysis framework is then presented and demonstrated with a case history. Finally, sensitivity analysis is performed to identify the factors to which the probability of damage is most sensitive and to analyze the effect of various assumptions of the input parameters on the computed probability of building damage.     

1,10-二氮杂菲分光光度测定钛合金中铁方法的改进

试样采用氢氟酸溶解,饱和硼酸络合,乙酸-乙酸铵作缓冲溶液控制酸度,三元有机铵盐作混合掩蔽剂,1,10-二氮杂菲分光光度法测定钛合金中铁。成功克服了传统分析方法中因受钒(4mg以上)干扰,显色液需放置隔夜后才能测定的缺陷,大大缩短分析时间,获得较满意的结果。该方法准确度高,分析结果重现性较好。     

基于罚函数法的冷连轧轧制规程优化设计

 合理的轧制规程是使轧制过程达到最佳状态的重要保证。规程设定中采用具有自学习功能的BP神经网络取代传统轧制力数学模型,选用Levenberg Marquardt算法对轧制力进行预报。采用等相对负荷目标函数,考虑到现场和设备所受限制,确定约束条件。利用罚函数法将有约束的最优问题转换成无约束的最优问题,对某厂冷连轧现场规程进行了优化设计,并对优化前后的轧制规程进行了分析和比较,优化效果令人满意,满足实际生产要求。     

210t转炉底吹供气参数优化模拟研究

为优化某厂210t转炉底吹供气效果,利用气-液两相流相互作用数值模拟方法,研究了底吹元件数量、布置方式和供气强度变化对熔池搅拌效果的影响.通过对8支、10支、12支底吹元件数量下的作用效果分析,得出12支底吹元件布置在0.63D(D为熔池直径)的同心圆上时,熔池内钢液流动相对较稳定,"死区"比例最低,混匀时间最短.随着...     

Effects of heavy reduction technology on internal quality of continuous casting bloom

Heavy reduction technology of the bloom is realised without modifying the hydraulic equipment if a crown roll is used. Experimental results of GCr15 showed that the ratio of reduction amount to broadening amount increased from 2.0 (flat roll reduction) to 4.4 (crown roll reduction), which indicated that reduction efficiency is significantly improved. It is evident that the enriched molten steel in the mushy zone will be squeezed out if the crown roll heavy reduction technology is adopted. Thus, centre segregation and V segregation is suppressed or even eliminated. The average centre carbon segregation index is reduced from 1.74 to 1.06, and negative segregation may occur. Meanwhile, the centre shrinkage cavity is clearly decreased and the centre porosity grade is remarkably reduced to 1.0. The calculation results of elastic–plastic FEM model showed that heavy reduction at the solidification end is very beneficial to improve the centre shrinkage cavity.     

精制铼酸铵除铊的试验探索

用粉末活性炭与KI吸附除铊效果不好.在溶液pH为10时,分析纯TiO2吸附铊的效果较佳.当除铊后液中Ti含量为0.1～1 mg/L时,树脂吸附后液Ti＜0.01 mg/L.较佳的工艺条件:精制铼酸铵与纯水的固液比1∶8,温度60℃溶解,加入分析纯双氧水(与精制铼酸铵液固比1∶1.8),保温反应1.5h后,加入分析纯二氧...     

气体搅拌用透气砖阻力系数的测试

在实验室测定了工业用的狭缝型透气砖进出口压力差及气体出口速度,得出透气砖的阻力系数近似为44/Re,流动状态可近似认为呈层流,阻力系数与相对粗糙度无关,仅是雷诺数的函数,阻力损失与出口速度成正比。从而可计算出透气砖阻力损失,进而确定透气砖气体进口压力。在工业应用中,正常吹氩的压力差不大时,透气砖阻力系数≈0.07。